The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 06, 1991
Filed:
Jan. 31, 1989
Applicant:
Inventors:
Gohji Uchikoshi, Higashimurayama, JP;
Tosihiko Otomo, Tokyo, JP;
Assignee:
Nakamichi Corporation, Kodaira, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369 4428 ; 369 4434 ; 369 54 ;
Abstract
An optical spot position detection device for an optical disk apparatus able to detect a track position of an optical spot on the recording tracks of an optical disk by dividing a space between centers of adjacent recording tracks into four areas and indicating one of the four areas where the optical spot exists so that a control signal for the optical spot can be provided.